public StackFrame UnwindStack(StackFrame frame, TargetMemoryAccess target,
Architecture arch)
{
if (frame.TargetAddress.IsNull)
return null;
TargetAddress address = frame.TargetAddress;
DwarfBinaryReader reader = new DwarfBinaryReader (bfd, blob, false);
while (reader.Position < reader.Size) {
long length = reader.ReadInitialLength ();
if (length == 0)
break;
long end_pos = reader.Position + length;
long cie_pointer = reader.ReadOffset ();
bool is_cie;
if (is_ehframe)
is_cie = cie_pointer == 0;
else
is_cie = cie_pointer == -1;
if (is_cie) {
reader.Position = end_pos;
continue;
}
if (is_ehframe)
cie_pointer = reader.Position - cie_pointer -
target.TargetMemoryInfo.TargetAddressSize;
CIE cie = find_cie (cie_pointer);
long initial, range;
if (is_ehframe) {
initial = ReadEncodedValue (reader, cie.Encoding);
range = ReadEncodedValue (reader, cie.Encoding & 0x0f);
} else {
initial = reader.ReadAddress ();
range = reader.ReadAddress ();
}
TargetAddress start = new TargetAddress (target.AddressDomain, initial);
if ((address < start) || (address > start + range)) {
reader.Position = end_pos;
continue;
}
Entry fde = new Entry (cie, start, address);
fde.Read (reader, end_pos);
return fde.Unwind (frame, target, arch);
}
return null;
}
void read_cie(DwarfBinaryReader reader)
{
long length = reader.ReadInitialLength ();
long end_pos = reader.Position + length;
int id = reader.ReadInt32 ();
bool is_cie;
if (frame.is_ehframe)
is_cie = id == 0;
else
is_cie = id == -1;
if (!is_cie)
throw new InvalidOperationException ();
int version = reader.ReadByte ();
if (version != 1)
throw new DwarfException (
reader.Bfd, "Unknown version {0} in CIE",
version);
string augmentation = reader.ReadString ();
if (augmentation.StartsWith ("eh")) {
reader.ReadAddress ();
augmentation = augmentation.Substring (2);
}
code_alignment = reader.ReadLeb128 ();
data_alignment = reader.ReadSLeb128 ();
return_register = reader.ReadByte ();
for (int pos = 0; pos < augmentation.Length; pos++) {
if (augmentation [pos] == 'z') {
reader.ReadLeb128 ();
// has_z_augmentation = true;
continue;
}
if (augmentation [pos] == 'L')
continue;
else if (augmentation [pos] == 'R') {
encoding = reader.ReadByte ();
continue;
}
else if (augmentation [pos] == 'P') {
continue;
}
throw new DwarfException (
reader.Bfd, "Unknown augmentation `{0}' in CIE",
augmentation[pos]);
}
columns = new Column [return_register + 2];
for (int i = 0; i < columns.Length; i++)
columns [i] = new Column (State.Undefined);
Entry entry = new Entry (this);
entry.Read (reader, end_pos);
reader.Position = end_pos;
}
ArrayList read_aranges()
{
ArrayList ranges = new ArrayList ();
if (debug_aranges_reader == null)
return ranges;
DwarfBinaryReader reader = new DwarfBinaryReader (
bfd, (TargetBlob) debug_aranges_reader.Data, Is64Bit);
while (!reader.IsEof) {
long length = reader.ReadInitialLength ();
long stop = reader.Position + length;
int version = reader.ReadInt16 ();
long offset = reader.ReadOffset ();
int address_size = reader.ReadByte ();
int segment_size = reader.ReadByte ();
if ((address_size != 4) && (address_size != 8))
throw new DwarfException (
bfd, "Unknown address size: {0}", address_size);
if (segment_size != 0)
throw new DwarfException (
bfd, "Segmented address mode not supported");
if (version != 2)
throw new DwarfException (
bfd, "Wrong version in .debug_aranges: {0}",
version);
if (AddressSize == 8)
reader.Position = ((reader.Position+15) >> 4) * 16;
else
reader.Position = ((reader.Position+7) >> 3) * 8;
while (reader.Position < stop) {
long address = reader.ReadAddress ();
long size = reader.ReadAddress ();
if ((address == 0) && (size == 0))
break;
TargetAddress taddress = GetAddress (address);
ranges.Add (new RangeEntry (this, offset, taddress, size));
}
}
return ranges;
}
